sndio support for playback and record
[libav.git] / libavdevice / sndio_dec.c
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15d59d2c
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1/*
2 * sndio play and grab interface
3 * Copyright (c) 2010 Jacob Meuser
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <stdint.h>
23#include <sndio.h>
24
25#include "libavformat/avformat.h"
26
27#include "sndio_common.h"
28
29static av_cold int audio_read_header(AVFormatContext *s1,
30 AVFormatParameters *ap)
31{
32 SndioData *s = s1->priv_data;
33 AVStream *st;
34 int ret;
35
36 if (ap->sample_rate <= 0 || ap->channels <= 0)
37 return AVERROR(EINVAL);
38
39 st = av_new_stream(s1, 0);
40 if (!st)
41 return AVERROR(ENOMEM);
42
43 s->sample_rate = ap->sample_rate;
44 s->channels = ap->channels;
45
46 ret = ff_sndio_open(s1, 0, s1->filename);
47 if (ret < 0)
48 return ret;
49
50 /* take real parameters */
51 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
52 st->codec->codec_id = s->codec_id;
53 st->codec->sample_rate = s->sample_rate;
54 st->codec->channels = s->channels;
55
56 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
57
58 return 0;
59}
60
61static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
62{
63 SndioData *s = s1->priv_data;
64 int64_t bdelay, cur_time;
65 int ret;
66
67 if ((ret = av_new_packet(pkt, s->buffer_size)) < 0)
68 return ret;
69
70 ret = sio_read(s->hdl, pkt->data, pkt->size);
71 if (ret == 0 || sio_eof(s->hdl)) {
72 av_free_packet(pkt);
73 return AVERROR_EOF;
74 }
75
76 pkt->size = ret;
77 s->softpos += ret;
78
79 /* compute pts of the start of the packet */
80 cur_time = av_gettime();
81
82 bdelay = ret + s->hwpos - s->softpos;
83
84 /* convert to pts */
85 pkt->pts = cur_time - ((bdelay * 1000000) /
86 (s->bps * s->channels * s->sample_rate));
87
88 return 0;
89}
90
91static av_cold int audio_read_close(AVFormatContext *s1)
92{
93 SndioData *s = s1->priv_data;
94
95 ff_sndio_close(s);
96
97 return 0;
98}
99
100AVInputFormat ff_sndio_demuxer = {
101 .name = "sndio",
102 .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"),
103 .priv_data_size = sizeof(SndioData),
104 .read_header = audio_read_header,
105 .read_packet = audio_read_packet,
106 .read_close = audio_read_close,
107 .flags = AVFMT_NOFILE,
108};